Abstract
La0.7Mg0.3(Ni1-xCox)3.5 (x=0.0-0.2) type hydrogen storage alloy was prepared. In order to optimizing the content of Co it was studied effects that Co replaced Ni on the structure and electrochemical properties of La0.7Mg0.3(Ni1-xCox)3.5(x=0.0-0.2) type hydrogen storage alloy X-ray diffraction (XRD) analyses showed that the alloys were composed of the LaNi5 phase with the CaCu5-type structure and the (La,Mg)2Ni7 phase with the Ce2Ni7-type structure. The maximum electrochemical discharge capacity increases with the increase of Co content. Moreover, the cycle stabilities of La0.7Mg0.3(Ni1-xCox)3.5 was improved remarkably by small quantity replacement Ni by Co, after 250 times, the discharge capacity was increased from 30% (x=0.0) to 65% (x=0.20).
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